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Finding the Fourth Proportional to 620,139.60, 929,990.70 and 220,793.40

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Solution

The fourth proportional to 620,139.60, 929,990.70 and 220,793.40 is: 331,112.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,139.60 : 929,990.70 = 220,793.40 : x
  2. Step 2: Convert to fraction form
    620,139.60/929,990.70 = 220,793.40/x
  3. Step 3: Cross multiply
    620,139.60x = 929,990.70 × 220,793.40
  4. Step 4: Simplify right side
    620,139.60x = 205,335,808,621.38
  5. Step 5: Solve for x
    x = 205,335,808,621.38/620,139.60
  6. Step 6: Final answer
    x = 331,112.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.